'''a=input()
if int(a)<18:
    print("you are too small")
elif int(a)<30 and int(a)>18:
    print("you are young")
elif int(a)<50 and int(a)>30:
    print("you are minddle-aged")
else:
    print("you are old")
year=int(input("请输入年份"))
if(year%4==0 and year%100!=0 or year%400==0):
    print("是润年")
else:
    print("不是闰年")
a=int(input("请输入a:"))
b=int(input("请输入b:"))
c=int(input("请输入c:"))
if a>b:
    if a > c:
      print("a is the largest")
    else:
        print("b is the largest")
else:
    if b > c:
        print("b is the largest")
    else:
        print("c is the largest")

#计算器
num1=float(input("请输入第一个数字:"))
num2=float(input("请输入第二个数字:"))
op=input("请输入运算符:")
if op=="+":
    print(num1+num2)
elif op=="-":
    print(num1-num2)
elif op=="*":
    print(num1*num2)
elif op=="/":
    print(num1*num2)
else:
    print("输入错误")
'''
